Photographic light-sensitive material having a back layer

ABSTRACT

In a photographic material having a backing layer for antihalation, the sticking of the back layer to other emulsion layers can be prevented when the material is rolled and stored at a high temperature and high humidity, by incorporating in the backing layer a surface active agent such as 2-ethylhexyl sodium sulfate, sodium N-stearoyltaurine, sodium stearate, sorbitan monostearate, sorbitan tristearate, polyoxyethylene sorbitan tristearate, polyoxyethylene sorbitan monolaurate and behenic acid amide. The surface active agent has the property of forming aggregates which prevent sticking of the backing layer to other layers with which it comes in contact.

United States Patent [72] Inventors Koji Kameyama;

Ikuo Fuutagawa, both of Kanagawa, Japan [21] AppLNo. 651,716

[54] PHOTOGRAPHIC LIGHT-SENSITIVE MATERIAL HAVING A BACK LAYER 4 Claims,No Drawings [52] U.S. Cl 96/84, 96/87 [51] Int. Cl 6031: 1/84 [50] Fieldof Search 96/84, 87 A, 87

[56] References Cited UNITED STATES PATENTS 3,433,638

3/1969 Ohi et a1. 96/84 Primary ExaminerRonald H. SmithAttorney-Sughrue, Rothwell, Mion, Zinn & Macpeak ABSTRACT: In aphotographic material having a backing layer for antihalation, thesticking of the back layer to other emulsion layers can be preventedwhen the material is rolled and stored at a high temperature and highhumidity, by incorporating in the backing layer a surface active agentsuch as 2- ethylhexyi sodium sulfate, sodium N-stearoyltaurine, sodiumstearate, sorbitan monostearate, sorbitan tristearate, polyoxyethylenesorbitan tristearate, polyoxyethylene sorbitan monoiaurate and behenicacid amide. The surface active agent has the property of formingaggregates which prevent sticking of the backing layer to other layerswith which it comes in contact.

PHOTOGRAPHHC LIGHT-SENSITIVE MATERIAL HAVING A BACK LAYER BACKGROUND OFTHE INVENTION:

1. Field of the Invention This invention relates to a photographiclight-sensitive material having an improved backing layer forantihalation and more particularly, it is concerned with an improvedphotographic material of which the undesirable sticking property causedby high-temperature and high humidity conditions is reduced byincorporating a surface active agent in the backing layer.

For the purpose of preventing the halation or scattering of light causedby reflection of light from a support to a light-sensitive emulsionlayer, it has generally been carried out to provide a so-called backinglayer on the back side of a light-sensitive emulsion layer of ablack-and-white or color photographic film by application of a solutionor dispersion of an antihalation dye or pigment such as carbon black inan alkali-soluble resin solution.

However, such backing layer, due to its hydrophilic property, tends topresent serious obstacles, such as being transferred and adhered toanother emulsion layer when stored at a high temperature and highhumidity in the form of a roll as in cinema film.

2. Description of the Prior Art Up to this time, a method ofincorporating an oil-miscible surface active agent in a backing layerhas been proposed to prevent the adhesion of the backing layer to otherlayers, but if too much is incorporated, the backing layer becomeshydrophobic and repellent to other surfaces. Thereby, the adhesivenessto a support is lowered and it is hardly removed rapidly by developing.Another attempt to prevent adhesion to a light-sensitive emulsion layer,by adding a matting agent, such as colloidal silica, to the raw materialfor the backing layer to coarsen the surface thereof, has generally beenunsatisfactory, primarily because a grain size of several microns is noteffective for preventing the adhesion and, if the matting agent has agrain size sufficient therefor, it tends to settle prior to application.

The principal object of the invention is to provide a photographiclight-sensitive material having a backing layer whose adhesiveness isimproved, wherein the aforementioned disadvantages are overcome.

SUMMARY OF THE INVENTION We have found that the object can beaccomplished by adding to a backing layer coating solution, consistingof an alkali-soluble resin, antihalation dye or pigment (hereinafterthey are called only dye"), such as carbon black and organic solvent, asurface active agent that is soluble in the organic solvent at normaltemperature, does not deteriorate the stability of the dispersion ofantihalation dye, and the solubility of which in the organic solventlowers at a certain low temperature to cause aggregation. That is tosay, when the coating solution containing the surface active agenthaving abovementioned property is coated onto the back side of aphotographic film, the surface active agent becomes aggregated with, forexample, carbon black in a size of 0. l-5 microns (the surface activeagent is granulated and carbon black is aggregated to a large size), asthe surface is cooled by heat of vaporization during the coating, andthus a coarsened backing layer is obtained. Adhesion to a photographicemulsion surface hardly occurs even when the photographic film havingsuch a backing layer was stored, for example, in the form of a roll.

Examples of surface active agents used in the invention, the solubilityof which in conventional organic solvents is large at normal temperaturebut becomes small at a somewhat lower temperature, are2-ethylhexylsodium sulfate, sodium N- stearoyltaurine, sodium stearate,sorbitan mono-stearate, sorbitan tristearate, polyoxyethylene sorbitantristearate, polyoxyethylene sorbitan monolaurate and behenic acidamide.

As the other components to be incorporated in the backing layer of ourinvention there may be used conventional materials. For example,styrene-maleic anhydride copolymer, vinyl acetate-maleic anhydridecopolymer or butyl vinyl ethermaleic anhydride copolymer is used as analkali-soluble resin, carbon black, 3,9-dihydroxy-6p-methoirystyrylxanthorium chloride,tetramethyl-l,4-diaminotriphenyl methane or Malachite Green (C.l. No.657), as an antihalation dye, and methanol, ethanol, acetone,isopropanol or methyl ethyl ketone as an organic solvent.

In the photographic material having the backing layer of the invention,not only is the adhesiveness to other materials improved, but thesubsequent processings can be carried out without any trouble. Althoughthe surface active agent suitable for use as an antiadhesive agent inthe invention is substantially hydrophobic, it is scattered asmicroscopic dots by aggregation, and there is no obstacle to permeationof a processing solution in the step of film elimination duringdeveloping, so that film elimination proceeds rapidly. Moreover, auniformly coarsened surface can be obtained because a satisfactoryliquid stability is maintained, in spite of the system being generallyunstable when a matting agent is dispersed in the coating solution.

EXAMPLE 1 Styrene-maleic anhydride copolymer 2.0 g. Methanol 50.0 g.Acetone 50.0 g. Carbon black 1.0 g. Behenic acid amide 0.2 g.

A photographic film having a coating of the foregoing composition as abacking layer and a coating of light-sensitive emulsion on a film baseof cellulose triacetate exhibited a good adhesion resistance after beingstored in a tightly wound roll.

EXAMPLE 2 Vinyl acetate-maleic anhydride copolymer 3.0 g. Methanol 75.0g. l-propanol 25.0 g. Carbon black l.5 g. Sodium stearate 0J8 g.

EXAMPLE 3 Butyl vinyl ether-maleic anhydride copolymer 2.0 g. Ethanol80.0 g. Methyl ethyl ketone 20.0 g. Carbon black L3 Polyoxyethylenesorbitan ester 0.25 g.

A coating solution of the foregoing composition was applied to the backside of a polyester film base having a light-sensitive emulsion layer inthe conventional manner and dried.

Even after the photographic film was wound tightly in a roll and stored,for 6 months, there was found no adhesion of the backing to the emulsionlayer.

What is claimed is:

1. In a photographic material having a photographic lightsensitiveemulsion layer and an antihalation backing layer on the [back] oppositeside of a film support on which the emulsion layer is coated, saidbacking layer being providing by applying a coating solution containingan alkali-soluble resin, an antihalation dye and organic solvent, theimprovement comprising a surface active agent selected from the groupconsisting of 2-ethylhexyl sodium sulfate, sodium-N-stearoyl-taurine,sodium stearate, sorbitan mono-stearate, sorbitan tristearate,polyoxyethylene sorbitan tristearate, and polyoxyethylene sorbitanmonolaurate incorporated in said coating solution, said surface activeagent being soluble in said organic solvent at ambient temperatures, butfonning a finely dispersed aggregate in said solution as said solutionis cooled, said aggregate serving to prevent sticking of the driedbacking layer to other surfaces with which it comes in contact.

2. A photographic material as claimed in claim I, wherein saidalkali-soluble resin is a member selected from the groups consisting ofstyrene-maleie anhydride copolymer. vinyl acetate-maleic anhydridecopolymer. butyl vinyl ether-maleic anhydride copolymer.

3. A photographic material as claimed in claim 1, wherein saidantihalation dye is a member selected from the groups consisting ofcarbon black, 3,9-dihydroxy-6-p-methoxystylxanthorium chloride,tetramethyll ,4-diaminotriphenyl methane and Malachite Green.

4. A photographic material as claimed in claim 1, wherein said organicsolvent is a member selected from the groups consisting of methanol,ethanol. acetone, isopropanol and methyl ethyl ketone.

* I i i t

2. A photographic material as claimed in claim 1, wherein saidalkali-soluble resin is a member selected from the groups consisting ofstyrene-maleic anhydride copolymer, vinyl acetate-maleic anhydridecopolymer, butyl vinyl ether-maleic anhydride copolymer.
 3. Aphotographic material as claimed in claim 1, wherein said antihalationdye is a member selected from the groups consisting of carbon black,3,9-dihydroxy-6-p-methoxystylxanthorium chloride,tetramethyl-1,4-diaminotriphenyl methane and Malachite Green.
 4. Aphotographic material as claimed in claim 1, wherein said organicsolvent is a member selected from the groups consisting of methanol,ethanol, acetone, isopropanol and methyl ethyl ketone.